How to protect my gateway IP?

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Feb 26th, 2008
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I have 2 6500 and we use HSRP , the gateway ip has a virtual MAC, but one computer has stolen this IP and the network crashed, how can I protect this IP?


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cleidh_mor Tue, 02/26/2008 - 06:19
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Was it a DHCP address that was given out that caused the problem?

You could simply put an ACL on your user VLAN interfaces blocking that IP.

jorgetomas Wed, 02/27/2008 - 02:08
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No, the problen is that in the same Vlan a host (manually) puts the gateway IP, the network is broken.

cleidh_mor Wed, 02/27/2008 - 02:34
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In that case, your best bet is probably to use static ARP entries so that a new host coming on to the network with that IP can't create a new ARP entry.

srue Wed, 02/27/2008 - 11:14
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you can't tell the person who's 'stealing' this IP to stop doing it?

or shut down his switchport.


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